Fundamentally I have an issue with people that don't want to have children for reasons of responsibility or low self-view.
It's only possible to reason this way because of a mixture of intelligence, restraint and responsibility. That's the traits you are weeding out of the human race. Because those without intelligence, restraint and responsibility but otherwise in the same situation would not be having children.
I do consider adoption a very noble thing to do, almost as noble as having children. Of course in both cases, with the precept of taking care of them well.
Even if it makes them suffer (more)? Or have a great chance of not succeeding?
I think your line of logic is close to the actual anti-natalist line of reasoning. We all suffer. Your bio kids would suffer. Your adopted kids would suffer. We know this, because everyone we know suffers. The anti natalist world view uses suffering as their philophical basis to call making kids immoral.
It's a very widespread view, particularly among feminists, though I personally also know some non-feminist autists who have latched on to it.
In other words, the quality of life of your own child will be somewhat heavily impacted negatively, while if you adopted, it won't as much or at all, by a relatively noticeable margin
I don't think we're very good judges of predicting this. My first instinct if you were someone close to me would be to interrogate you about why you would think this way. I would consider the source to more likely be anxiety, depression or low self esteem, than whatever specific conditions you are thinking about. I'm not saying I'm sure it has to be the source, but that's what I would investigate. Because I have seen it both in myself and others that those paths of thinking are built more from a sense of doom and insecurity than the actual reasons I was thinking about at the time that I thought was informing them.
That's not to negate any of your suffering from whatever disease or genetics may be causing you suffering that you wouldn't want to pass on. Just that the depressed view on it is a much stronger modifier than you may currently be accounting for, because that's what I saw in myself and others more than once. That later without curing the conditions that I was thinking about, the genetic makeup for example, it's possible to get a much better view simply by changing perspective and outlook.
The fact that you would consider not having bio children for responsible reasons shows that you have the genes of someone that thinks responsibly about others. Which is an excellent trait to propagate.
Finally one of the taboos of our society is to overestimate the parental effect and underestimate the genetic effect. Twin adoption studies show that for complex behaviour like level of education followed in life, or whether you smoke or drink, is much more decided by who your bio parent is than who your adoptive parent it. Twins adopted by different parents correlate about 0.7 to each other and 0.1 to their adoptive parents.
I would urge people that compare adoption to having children themselves to consider that adoption is very benevolent, but it is also very different. You'll have a much harder time understanding and getting the moods and drives of an adopted child.
@We Are The Witches
and finally I'd like to say how valuable it is that you are discussing this subject. Good for you about thinking about these things out loud, asking questions. More people should do that.